/Engine/Source/Runtime/RenderCore/Public/ShaderCodeArchive.h
This function creates the archive header, including splitting shaders into groups.
static void CreateIoStoreShaderCodeArchiveHeader ( const [FName](API\Runtime\Core\UObject\FName) & Format, const [FSerializedShaderArchive](API\Runtime\RenderCore\FSerializedShaderArchive) & SerializedShaders, [FIoStoreShaderCodeArchiveHeader](API\Runtime\RenderCore\FIoStoreShaderCodeArchiveHeader) & OutHeader )